.container {
    display: flex;
    flex-direction:column;
    justify-content: center;
    align-items: center;
    width: 100%;
    height: 400px;
    padding: 5px;
    background-color: lightgray;
}

.title {
    font-size: 30px;
    text-align: center;
    width: 200px;
    height: 100px;
}
.row {
    display: flex;
    flex-direction:row;
    justify-content: center;
    align-items: center;
    width: 100%;
    height: 70px;
}

.key-btn {
    margin: 4px;
    border-radius: 16px;
    height: 65px;
    width: 10%;
    font-size: 30px;
    background-color: whitesmoke;
    color: black;
/*    box-shadow: 0 0 2px #aaa;*/
}

.key-btn-gray {
    margin: 4px;
    border-radius: 16px;
    height: 65px;
    width: 10%;
    font-size: 30px;
    background-color: gainsboro;
    color: black;
}

.key-btn-image {
    margin: 5px;
    border-radius: 16px;
    height: 65px;
    font-size: 30px;
    color: black;
/*    background-color: whitesmoke;*/
    background-repeat: no-repeat;
    background-size:40px;
}

.key-num {
    margin: 4px;
    border-radius: 16px;
    height: 65px;
    width: 30%;
    font-size: 30px;
    background-color: whitesmoke;
    color: black;
}